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<?php var_dump(array(1,2) + array(3,4)); echo "\n"; var_dump(array_merge(array(1,2), array(3,4)));
Output for 5.3.12 - 7.2.0
array(2) { [0]=> int(1) [1]=> int(2) } array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) }